Update xeus-cpp-lite example notebook (#227)

Author: anutosh491

.github/workflows/deploy-github-page.yml

@@ -78,6 +78,8 @@ jobs:
               --XeusAddon.prefix=${{ env.PREFIX }} \
               --contents README.md \
               --contents notebooks/xeus-cpp-lite-demo.ipynb \
+              --contents notebooks/images/marie.png \
+              --contents notebooks/audio/audio.wav \
               --output-dir dist
 
       - name: Upload artifact

CMakeLists.txt

@@ -389,7 +389,11 @@ set(XCPP_HEADERS
 add_library(xeus-cpp-headers INTERFACE)
 set_target_properties(xeus-cpp-headers PROPERTIES PUBLIC_HEADER "${XCPP_HEADERS}")
 
-install(TARGETS xeus-cpp-headers PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/xcpp)
+if (EMSCRIPTEN)
+    install(TARGETS xeus-cpp-headers PUBLIC_HEADER DESTINATION ${SYSROOT_PATH}/include/xcpp)
+else ()
+    install(TARGETS xeus-cpp-headers PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/xcpp)
+endif()
 
 # xeus-cpp
 # ========